[Libwebsockets] Configure error

Jack Mitchell ml at communistcode.co.uk
Tue Jan 15 15:31:01 CET 2013


On 15/01/13 14:24, Jack Mitchell wrote:
> On 15/01/13 14:21, "Andy Green (林安廸)" wrote:
>> On 15/01/13 22:08, the mail apparently from Jack Mitchell included:
>>
>> Wow...
>>
>>> test-server.c: In function ‘callback_http’:
>>> test-server.c:243:50: error: array subscript is above array bounds
>>> [-Werror=array-bounds]
>>> test-server.c:244:47: error: array subscript is above array bounds
>>> [-Werror=array-bounds]
>>
>> huh... that's
>>
>>     pollfd_maps[hash][n].index = 
>> pollfd_maps[hash][pollfd_count[hash]].index;
>>     pollfd_maps[hash][n].fd = pollfd_maps[hash][pollfd_count[hash]].fd;
>>
>> all of the array indexes are variables...
>>
>> For the compiler to think it could say there was a problem either 
>> hash or n would have to have been resolved to be (a big) constant.
>>
>> I'm not really seeing how that can be legit when it compiles here on 
>> gcc 4.7.2 with pedantic and Wall Werror (and works then).
>>
>> Is the compiler a bit new or anything?
>>
>> -Andy
>>
>
> [jack at archHP ~]$ gcc -v
> Using built-in specs.
> COLLECT_GCC=gcc
> COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.2/lto-wrapper 
>
> Target: x86_64-unknown-linux-gnu
> Configured with: /build/src/gcc-4.7.2/configure --prefix=/usr 
> --libdir=/usr/lib --libexecdir=/usr/lib --mandir=/usr/share/man 
> --infodir=/usr/share/info --with-bugurl=https://bugs.archlinux.org/ 
> --enable-languages=c,c++,ada,fortran,go,lto,objc,obj-c++ 
> --enable-shared --enable-threads=posix --with-system-zlib 
> --enable-__cxa_atexit --disable-libunwind-exceptions 
> --enable-clocale=gnu --disable-libstdcxx-pch --enable-libstdcxx-time 
> --enable-gnu-unique-object --enable-linker-build-id --with-ppl 
> --enable-cloog-backend=isl --disable-ppl-version-check 
> --disable-cloog-version-check --enable-lto --enable-gold 
> --enable-ld=default --enable-plugin --with-plugin-ld=ld.gold 
> --with-linker-hash-style=gnu --disable-multilib --disable-libssp 
> --disable-build-with-cxx --disable-build-poststage1-with-cxx 
> --enable-checking=release
> Thread model: posix
> gcc version 4.7.2 (GCC)
>
> I can say that it builds fine in my cross compile environment which is 
> also GCC 4.7.2 but it is a completely different tool chain to my 
> x86_64 box.
>

--without-testapps allows it to build fine, so the issue is only present 
in the test-servers.

Regards,

-- 

   Jack Mitchell (jack at embed.me.uk)
   Embedded Systems Engineer
   http://www.embed.me.uk

--




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